冷热电联产(combined cooling,heat and power,CCHP)系统的效率评价指标对其优化设计、经济运行等至关重要。基于小功率燃气轮机为核心的CCHP系统基本元件的变工况典型解析特性,对比分析了CCHP系统当量火用效率、经济火用效率、总能利...冷热电联产(combined cooling,heat and power,CCHP)系统的效率评价指标对其优化设计、经济运行等至关重要。基于小功率燃气轮机为核心的CCHP系统基本元件的变工况典型解析特性,对比分析了CCHP系统当量火用效率、经济火用效率、总能利用率、节能系数等"效率"形式及其影响因素。采用不同的效率指标评价以小功率燃气轮机为原动力的2类CCHP系统的全工况性能,以说明不同效率指标的差异。分析表明,前述效率形式都不能给出完全合理的评价结果。但相对而言,节能系数能比较合理评价文中所述两种CCHP系统的优劣,但部分评价结论仍存商榷之处;CCHP系统的部件匹配及经济运行,可综合按全工况节能系数及经济火用效率来评价。展开更多
This study presents an ORC-HP combined system driven by diesel engine exhaust. This paper focuses on the feasibility and performance of the combined system under heating mode to heat a coach. The performances of the c...This study presents an ORC-HP combined system driven by diesel engine exhaust. This paper focuses on the feasibility and performance of the combined system under heating mode to heat a coach. The performances of the combined system with different parameters, including condensation temperature and evaporation pressure in ORC system, gas cooler outlet pressure, gas cooler outlet temperature and evaporation temperature in HP system, have been analyzed. The results show that the combined system can fully meet the demand of heat production. The optimal flow division ratio(rp) of 0.32 is selected by analyzing the system performance. Low condensation temperature is beneficial to the combined system performance. There exists a suitable range of evaporation temperature, gas cooler outlet pressure and gas cooler outlet temperature to achieve excellent performance. The heating coefficient of performance(COP_h) shows a first increasing and then decreasing trend with gas cooler outlet pressure, namely there exists an optimal gas cooler outlet pressure that achieves the maximum COP_h. The maximum total efficiency, COP_h and heating capacity can reach up to 48.44%, 4.78 and 176.56 kW, respectively. These results show significant energy savings by applying the ORC-HP combined system.展开更多
文摘冷热电联产(combined cooling,heat and power,CCHP)系统的效率评价指标对其优化设计、经济运行等至关重要。基于小功率燃气轮机为核心的CCHP系统基本元件的变工况典型解析特性,对比分析了CCHP系统当量火用效率、经济火用效率、总能利用率、节能系数等"效率"形式及其影响因素。采用不同的效率指标评价以小功率燃气轮机为原动力的2类CCHP系统的全工况性能,以说明不同效率指标的差异。分析表明,前述效率形式都不能给出完全合理的评价结果。但相对而言,节能系数能比较合理评价文中所述两种CCHP系统的优劣,但部分评价结论仍存商榷之处;CCHP系统的部件匹配及经济运行,可综合按全工况节能系数及经济火用效率来评价。
基金financially supported by National Natural Science Foundation of China (Grant No. 51776005, Grant No. 51376011)National Key R&D Program of China (Grant No. 2016YFE0124900)
文摘This study presents an ORC-HP combined system driven by diesel engine exhaust. This paper focuses on the feasibility and performance of the combined system under heating mode to heat a coach. The performances of the combined system with different parameters, including condensation temperature and evaporation pressure in ORC system, gas cooler outlet pressure, gas cooler outlet temperature and evaporation temperature in HP system, have been analyzed. The results show that the combined system can fully meet the demand of heat production. The optimal flow division ratio(rp) of 0.32 is selected by analyzing the system performance. Low condensation temperature is beneficial to the combined system performance. There exists a suitable range of evaporation temperature, gas cooler outlet pressure and gas cooler outlet temperature to achieve excellent performance. The heating coefficient of performance(COP_h) shows a first increasing and then decreasing trend with gas cooler outlet pressure, namely there exists an optimal gas cooler outlet pressure that achieves the maximum COP_h. The maximum total efficiency, COP_h and heating capacity can reach up to 48.44%, 4.78 and 176.56 kW, respectively. These results show significant energy savings by applying the ORC-HP combined system.
基金supported by the Key Program of the Natural Science Foundation of Zhejiang Province(LZ21E060001)the Key Research and Development Plan of Zhejiang Province(2020C03115)。
